Valve-grinding machine



H. E. Hmmm VALVE GRlNDiNG MACHINE. APPLICATION FILED AUGJS, 1923" amlmfl; @M4-MQ@ @G W- N22 3 SHEETS-SHEET l.

`H. E. FLETCHER.

VALVE GRINDING MACHINE.

APPLICATION man Aue.18.192o.

Patented @et Mi, i922? 3 SHEETS-SHEEX 3.

25/5 l 43. l I v V M N -M I, \\v \1 y atented ct.. lil', l

i "will l i VALVE-GRIN DIN G- MACHINE.

Application filed August 18, 19V).

To all whom. it may conce/m.' y

Be it known that l, HERBERT E. FLETCHER, a citizen of the United States, and a resident of Lynn, county of Essex, and State of Massachusetts, have invented certain new and useful specification The present invention relates` more particularly to machines for grinding the faces of valves of internal combustion engines and it primarily aims to provide an electrical motor driven grinding mechanism of a compact arrangement which may be readily set up for use and connected to the ord1- nary electrical lig ting circuit for power and aunachine by the use of which valves may be quickly, easily and accurately ground or re-surfaced.

The invention has for a further object to provide a valve holding device or chuck for machines of this charactr which may be easily and readily adjusted so that the-face ofthe valve which is to be ground may at all times be retained in proper position with respect tothe grinding element without altering the positionor path of travel of the latter.

` With the above and other objects in view the invention consists in the novel features of construction, arrangement, combination and formation of parts as will be hereinafter more fully described and particularly pointed out in the appended claims.

ln the accompanying drawings;

F igure 1 is va plan view of the machine embodying the present invention.

Figure 2 is a side elevation of the same.

Figure 3 is an end elevation, and,

Figure 4 is a detailed vertical section through the valve holder or chuck taken on the line A-YA of Figure 1.

Referring now more particularly to the drawing wherein like and corresponding parts are designated by similar reference characters throughout The machine is mounted upon a suitable support comprising preferably of a rectangular base plate 2 having formed therewith and arranged adjacent the medial ortion thereofa vertical block 31. This b ook 31 has formed therewith and extending longitudinallyv from one end thereof the guide rails or track 32. Arranged upon -and adapted to travel upon this'track 32 is a carriage 3. Journalled within suitable bear- Improvements in Valve-GrindI ing Machines, of which the followingy is a" the several views.

Serial No. 404,463.

ings formed within this block 31 is a screw 23 and the c arrlage 3 is so connected to this screw that upon the manual rots ,ion thereoffthrough the medium of the hand wheel 8, the carriage will be caused to travel .upon the tracks in a longitudinal direction. The upper face of with a dove-tail track upon which slides a block 4. A screw 24 is also mounted in suitable bearings within the carriage-`3 and is so connected to this block 4 that upon the manual rotation of this screw by means of the hand wheel 7 the block 4 will be caused to travel in a lateraldirection or in a direction at right angles to the path of travel of the carriage 3.A Pivotally mounted upon this block 4 is a chuck holder'which consists of a circular base member 33 having a pair of arms 34 formed therewith and cast With lthe upper ends of these arms 34 is a sleeve o forming a bearing or holder for the chuck. From this' construction it is obvious that the chuck holder may be rotated upon the -block 4.and retained in its adjusted position by means of the nut 35. y The circular base member 33 may be provided with suitable graduation (not shown) so. that the adjusted position of the chuck may be readily ascertained.

Secured to and mounted upon this block 31 is an electric motor which may obtain its power from an ordinary lighting circuit- The armature'shaft of this motor has secured to one end thereof a grindina element 16 whereas, its opposite end has keyed thereto a pulley 12.

Formed with the chuck holder 5 is a depending arm 36 having a suitable bearing 37 arranged in the lower end thereof. Formed with the basev2 is a vertically eX- tending arm carrying a bearing 38 and journalled within these bearings 37 and 38V is a. shaft comprising two sections, 19 and 20 respectively.

These sections 19 and 20 may be connected by means of a slot and pin connection so that they may turn in unison. Freely mounted upon the section 20 of this shaft is a grooved pulley 13 and the latter is connected by means of a belt 30` to the pulley 12 carried by the armature shaft of the motor, so that when the motor 1 is set in motion the pulley Slidably vmounted upon this section 2O of the shaft is a sleeve 39 and this sleeve 39 is connected through a coil spring 17 to the this carriage 3 is provided 13 will revolve therewith.`

, within a groove shaft. rl`his sleeve 39 carries a cone-shaped clutch member which is adapted to engage with the other member of the clutch .carried by' the pulley 13 so that when these clutch members are engaged and the pulley into and out of engagement with the clutch member carried by the pulley 13. Arranged within the support 40 is a vertically movable spring pressed pin g which extends in the path of travel of the lever 1.4 and this j handle 42 thereby When as is better illuspin -15 is provided with a handle 42. the lever 14 is in position,

trated in Figure 1, the clutch members will be engaged and this pin 15 will retain the lever 14 in this position. When it is desired to disconnect the clutch members, thel pin 15 is depressed by pressingl upon the permitting t e lever 14 to be swung' upon its pivoted connection.

The section 19 of the shaft is flexible and isenclosed'by a flexible casing 18. Keyed to the outer end of this section 19 ofthe' i vshaft is a pulley 10 over which passes a belt 29 and this belt 29 also passes over the pulley 11.'.

The chuck comprises a head portion v6 'having 'a cylindrical spindle 43 formed therewith and this spindle 43 is journalled i within the sleeve 5. One end of the spindle f wit in the spindle 43 the split chuck jaws 26 43 extends beyond the' sleeve 5 and has fastenedther'eto in any suitable or well-.known manner the pulley 11 so that the spindle ma rotate with thea/pulley 11. Arranged formed with one end thereof and its opposite end projects beyond the spindle v43 and has connected thereto a hand wheel 9. The outer ends of the chuck -jaws 33 are vof a conical configuration as is better illustrated in Figure 4, and are adapted to slide withina corresponding recess formed withinvthe head 6 so that l upon the longitudinal movement of these ranged between this jaws they may expand or be brought intol gripping engagement with the stems of the valves to be ground. These jaws may be adjusted tothe desired position by turning the handle wheel 9. Slidably mounted within the sleeve 44 is a block 27 and ary block 27`and the hand wheel 9 is a coil spring 28.

the face of a valve, the stent thereof is inserted within the sleeve '445 until the block 27 is forced inwardly against the tension of.the spring 28. B adjusting the hand wheel 9. the jaws 26 Wi l what I claim as is a tube 44 havingbe brought into giipj'iing engagement; with the valve stein `thereby holding the valve tightly within the chuck. The chuck may be then advanced or adjusted until the valve isin such a position that it will engage the grinding element 1G. The motor 1 is then set in motion and the lever 14 moved so that the clutch members will be brought into engagement whereby the spindle 43 will be setiii motion through the mechanism as heretobefore described. As the sleeve 44 carrying the valve stein is held in frictional contact with the spindle 43, by the adjustment of the hand wheel 9 the valve will also be rotated. By turning the hand wheels 7 and8 the chuck may be so adjusted as to bring the valve into and out of engagement with the grinding wheel 1G. When it is desired to remove the valve the clutch members are disengaged by moving the lever 14 thereby stopping the rotation of the valve and by adjusting the hand wheel 9 the chuck jaws will release the valve stem and as the block 27 is exerting the pressure upon the inner end of the valve stem its removal will be greatly facilitated.

Having fully described my invention new and desire to secure by Letters Patent is j 1. A valve grinding machine coiiipiisiiig in combination a support, a carriage adjustably mounted upon said support, a chuck holder adjustably mounted upon said carriage, a motor mounted upon said support, a grinding element carried by said motor, a flexible shaft mounted upon said support, one end of said shaft being operatively connected to said .c huck whereby it may rotate therewith, a clutch for operatively connecting said motor with said flexible shaft, and a lever mounted upon said support for operating said clutch.

2. A valve grinding machine comprising in combination a support, a rotatable screw mounted within said support, a cari'iage adapted to travel in a longitudinal direction upon said support and being operatively connected to said screw, a block slidably mounted upon said carriage, means for causing said block a sleeve rotatably supported upon said block, a spindle journalled within said sleeve, chuck jaws carried by said saindle, a hand wheel connected to said chuck jaws for adjusting the saine, a motor mounted upon said support,a grinding element carried by said motor, a flexible shaft arranged upon said support, means for operatively connecting one end of said shaft with said spindle, a clutch member for operativelv connecting said shaft with said motor and a lever pivotally ino'iinted upon said support for actuatin said .clutch member substantially as and inthe manner set forth.

to traverse said carriage in combination,

a base plate, a.l lock merma on said plate, guide rails extending from one end not said block, a rotatable screw journalled in ,the block between said 5 r'rage mounted on said .guide rails, a oar# ra1ls and connected iolneans for adjusting said holder,

in said holder, a motor the base plate block,

a chuck on the other end of agrinding elementi carried by the motor, an from, Said 'chuck holder, lower end orf said arm, a one side of the base plate a bearing inthe bearing sleeve on block, a bearing l at the motor end of the base plate, connectedshaftng disposed in'said bearings, driving connection between said motor, shaftng and4 chuck for rotation thereof, and means for regulating said drlving'connection.

HERBERT vEUGENE ELEroHEE.

arm depending 

